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Dermot added: “Michael is an effortless showman, so those patent shoes will not be easy to fill.

“But it’s an honour to be asked to step in with Emma to host the Brits.”

Brits chairman Jason Iley didn’t rule out Michael returning to host the show in the future. He said: "Our thoughts go out to Michael and his family. We would love to see him on our stage in the future."

Michael Bublé pulled out after his son was diagnosed with cancer (Image: Getty)

But added about Dermot and Emma: "They are currently the most in demand presenters in the UK, with a huge passion for music, and to get the both of them is very exciting for us."

Chart-topping singer Michael cancelled all work commitments last year following Noah’s devastating diagnosis in November, and told Brit Award bosses he would not be attending.

Doctors have given toddler Noah 90% chance of survival and he is currently undergoing chemotherapy with Michael, 41, and his actress wife Luisana Lopilato , 29, by his side.

Emma and Dermot host rival shows The Voice and The X Factor

The couple have a second son Elias, who is one.

A source said: “It is a delicate situation due to the nature of Noah’s illness. No pressure was ever put on Michael to fulfil his obligations.

“He will always be welcome at the BRITs but it’s important that he is with his family. It would not look good to be singing and dancing on stage while his son is so ill.”